Improvement in concrete pavements



J. MURPHY (JoncretePavement.

No.219,501. Patented Sept. 9,1879.

WITNESSES: INVEfiTOR:

ATTORNEYS.

N, PEYERS, PNOTO-LITHOGRAPHER. WASHINGTON, D G.

1'0 all whom it may concern:

Be it known that I, JOHN MURPHY, of Golnmbus, in the county of Franklinand State -of Ohio, have invented a new and Improved Concrete Pavement;and I do hereby declare that the following is a full, clear, and exactdescription of the same, reference being had to the accompanyingdrawings, forming part of this specification, in \vhic Figure I is a vextical section across the roadway. Fig. 2 is a plan view, showingdifferent strata of materials.

My invention relates to an improved pavement having a base ofcobble-stone; and it consists in combining with the cobble-stone amastic for filling up the interstices and giving a smooth upper surface,composed of pulverized iron slag, pulverized stone, dried sand, oxide ofiron, lime, and pitch or asphaltum and coal-tar.

In the drawings, A represents the road-bed, which is first graded,rolled, and covered with a layerof sand, B. Upon this bed of sand thecobblestones O are then packed with their longitudinal axes in verticalposition. For filling in the interstices between the cobblestones, andgiving a smooth and uniform surface, I then place upon the cobble-stonesa mastic, E, which is forced between the stones JOHN MURPHY, orCOLUMBUS, OHIO.

IMPROVEMENT n coNoRET PAVEMENTS.

Bpecification forming part of Letters Patent No. 219,501., datedSeptember 9, 1879; application filed July 28, 1879.

and rendered smooth upon its upper surface by means of heavy rollers.

The composition of this mastic constitutes the prominent feature ofmyinvention, and is as follows: twenty-five per cent. of pulverized ironslag; twenty per cent. of pulverized stone; ten per cent. of dried sand;eight per cent. of pulverized oxide of iron; seven per cent. ofpulverized lime or lime stone; thirty per cent. of pitch or asphaltum.

I am aware that most of these ingredients have been used before inpaving-com positions, and I therefore only claim the samewheuusedtogether to form a paving-com osition which possesses great enduringproperties, and one specially adapted to be used in connection with acobble-stone base.

What I claim is A pavement consisting of a base of cobblestone and amastic for a top'dressing oompouud of pulverized iron slag, pulverizedstone, dried sand, oxide of iron, lime or its equivalent, and pitch orasphaltum, combined in or about the proportions indicated, for thepurpose described.

JOHN MURPHY. Witnesses:

I. D. SULLIVAN, Tnos. S. GATES.

